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CHARLES S. IVI-IEELVBIGHT, OF PROVIDENCE, R-IIODE ISLAND.

PAPER-PULP DIGESTER.

SPECIFICATION forming part of Letters'latent No, 307,608, dated NovemberI, 188%.

Application filed May 10, 1884.

To all whom it may concern:

Be it known that I, CHARLES S. \VHEEL; WRIGHT, of the city and countyofProvidence, and State of Rhode Island, have invented certain new anduseful Improvements in Paper- ]?ulp Digesters, of which the following isa full, clear, and exact description, reference being had to theaccompanying drawings, forming part of this specification.

My invention relates to the digesters used in the manufacture of woodpulp; and the object of my invention is to so construct the digester asto facilitate and simplify the oper ation of setting up the same, andalso to so construct the digester as to exclude the steam from directcontact with the contents of the digester.

To these ends my invention consists in the peculiar and novelconstruction and arrange ment of the digester, as hereinafter described,and pointedv out in the claims.

Digesters used in the manufacture of paperpulp are necessarily of greatsize, and as they have to stand high internal pressure they should bebuilt very strongly. As heretofore constructed the building of thesedigesters has been a very difficult and costly operalion, owing to theirsize and t0 the fact that they have been built up of as few sections aspossible in order to lessen the amount of leakage resulting from highinternal pressure. By my improved construction these large digestcrs maybe cheaply and yet strongly built, and this I accomplish in the mannerwhich I will now describe with reference to the accompanying drawings,in which Figure l is a transverse vertical section of my improveddigester. Fig. 2 is a sectional view of one of the upper joints indetached Fig. 3 is a similar view of one of the lower joints.

In the said drawings, A designates the outer, and B the inner, shell ofthe digester, which inclose between them the annular space a,constituting the steam -j acket. The outer shell, A, is composed of theannular sections a a a a, while the inner section is composed of thesections I) b b Z), similar to and concentric with the outer sections.These sections are ofboilee iron.

0 G O designate a number of iron rings ar- (No model.)

ranged in pairs and each of L shape, the straight sides of each pair ofrings being placed in contact. These rings are held together by rivetsor bolt-s c, passing vertically through the ends of the rings, as shownin Figs. 2 and 3. The plates A and B are secured to the rings 0 by boltsor rivets 0, passing horizontally through the rings and plates, as shownin Figs. 1 and 2. Between the rings 0 the plates A B are strengthened byrivets 0, passing horizontally through the plates and steamspace a, and.surrounded each within the steanrspace by a sleeve, 0", by which meansthe end of the rivet may be upset without injuring the plates. The lowerring, 0, is not L-shaped, but is plain, as shown in Fig. 1, while theupper ring of the upper pair ofrings, G, is formed to correspond withthe oblique direction of the shoulder or hood of the digester. The rings0 by which the hood is joined to the cap D, are each formed with aseries of recesses, d, in which the bolts (2 are removabl y secured,each of said bolts beinghinged at its lower end to a ring, (1 as shownin Fig. 1, so that the cap may be readily removed. It will thus be seenthat the largest sized digesters may be readily set up in sections, andthat when so set up they are perfectly strong. It will also be seen thatthe steam does not come into direct contact with the contents of thedigester, but flows through the steam-space 0'. The sections of thedigester are of such sizeas to admit of ready transportation. The ringsmay be made of any convenient dimension. A suitable metallic lining(preferably copper) is to be placed on thcinside oftheinnershell.

Having thus described my invention, I claim 1. An improved digesterhaving double walls made in sections and united section to section andwall to wall. by rings, substantially as described.

2. The combination, with the shell-sections (l, b, of the rings 0, towhich the said sections are bolted, substantially as described.

3. The combination, with the sections a a Z) Z), the hood and the capI), of the rings 0 0 Cf and the bolts 0 c d, substantially as described.

4. The combination, with the digester con structed as described andprovided with the hood and cap, of the rings 0 d", and the bolts and therivets 0 with the sleeves c, 0011- hinged to said ring (P, and arrangedto enter strueted and arranged as described. recesses in the rings 0substantially as described CHAS. S. WHEELWRIGHT. 5. The combination,with the shells A B, Witnesses: composed of the sections a ab b, thehood JOSEPH A. MILLER,

and cap, of the rings 0 G 0 the bolts 0 c, J. A. MILLER, Jr.

